AR Sensor is an Android app developed by Ken Kawamoto that allows users to visualize sensor data from their phones in 3D space using augmented reality (AR) technology. With this app, users can see the spatial WiFi signal strength in their homes and observe 3D magnetic field lines around a magnet.

To use AR Sensor, your device needs to support ARCore, which can be checked on the ARCore supported devices list provided by Google. Once installed, the app provides a unique and immersive way to interact with sensor data. Users can explore and understand the strength of the WiFi signal in different areas of their homes, helping them optimize their WiFi setup for better coverage.

Additionally, AR Sensor allows users to visualize and study the 3D magnetic field lines around a magnet. This feature can be particularly useful for educational purposes, allowing users to observe the behavior of magnetic fields in a hands-on and interactive way.

For more detailed information on how AR Sensor works, the developer has provided a blog post explaining the underlying technology and concepts. The app is available for free on the Google Play Store, making it accessible to anyone interested in exploring and visualizing sensor data in a unique and engaging way.